RIM today released a new beta version of Facebook v2.0 through BlackBerry Beta Zone and it's the biggest update to the Facebook app in more than three years. This update includes a new UI and Facebook Chat. Here is more info:

Facebook for BlackBerry smartphones v2.0, with a new look and feel, provides a more integrated, compelling mobile Facebook experience and makes it even easier for BlackBerry users to keep track of friends, book meetings and add content to their profiles.

Please note the initial beta release will be available for BlackBerry 6 users only, but support for BlackBerry Device Software 4.6 and higher will be added in subsequent beta releases and will be available at launch.